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Sometimes you’re asked to design a network that will reroute around a failure in milliseconds. Is that feasible? Maybe. Is it simple? Absolutely not.
In this series of blog posts we’ll start with the basics, explore the technologies that you can use to reach that goal, and discover one or two unexpected rabbit holes.

Fast failover is just one of the topics we’ll discuss in Advanced Routing Protocol Features part of How Networks Really Work webinar.

In this video, Orhan Ergun and Jeff Tantsura talk about Fast Reroute mechanisms briefly. After that they explain datacenter CLOS topologies, explain what is Fast Rehash and how Fast Rehash is used in real life networks. Also, the applicability of Fast Rehash in ECMP. Old ECMP and new ECMP hashing behaviors covered in this talk as well.